[PATCH] clk: k210: Fix error calculation on 32bit
k210 is 64bit but the driver and tests are also built in sandbox, and that can be built 32bit.
BIT(32) does not work on 32bit, shift before subtraction to fit into 32bit integer with BIT values.
Signed-off-by: Michal Suchanek msuchanek@suse.de ---
drivers/clk/clk_k210.c | 2 +- test/dm/k210_pll.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/clk_k210.c b/drivers/clk/clk_k210.c index 1961efaa5e..e85f8ae14a 100644 --- a/drivers/clk/clk_k210.c +++ b/drivers/clk/clk_k210.c @@ -846,7 +846,7 @@ again:
error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio, r * od); /* The lower 16 bits are spurious */ - error = abs((error - BIT(32))) >> 16; + error = abs((error >> 16) - BIT(32 - 16));
if (error < best_error) { best->r = r; diff --git a/test/dm/k210_pll.c b/test/dm/k210_pll.c index a0cc84c396..622b1c9bef 100644 --- a/test/dm/k210_pll.c +++ b/test/dm/k210_pll.c @@ -33,7 +33,7 @@ static int dm_test_k210_pll_calc_config(u32 rate, u32 rate_in, error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio, r * od); /* The lower 16 bits are spurious */ - error = abs((error - BIT(32))) >> 16; + error = abs((error >> 16) - BIT(32 - 16)); if (error < best_error) { best->r = r; best->f = f;
On Thu, Oct 13, 2022 at 10:34:29PM +0200, Michal Suchanek wrote:
k210 is 64bit but the driver and tests are also built in sandbox, and that can be built 32bit.
BIT(32) does not work on 32bit, shift before subtraction to fit into 32bit integer with BIT values.
Also see https://patchwork.ozlabs.org/project/uboot/patch/20221016071035.461454-1-hei...
Signed-off-by: Michal Suchanek msuchanek@suse.de
drivers/clk/clk_k210.c | 2 +- test/dm/k210_pll.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/clk_k210.c b/drivers/clk/clk_k210.c index 1961efaa5e..e85f8ae14a 100644 --- a/drivers/clk/clk_k210.c +++ b/drivers/clk/clk_k210.c @@ -846,7 +846,7 @@ again:
error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio, r * od); /* The lower 16 bits are spurious */
error = abs((error - BIT(32))) >> 16;
error = abs((error >> 16) - BIT(32 - 16));if (error < best_error) { best->r = r;
diff --git a/test/dm/k210_pll.c b/test/dm/k210_pll.c index a0cc84c396..622b1c9bef 100644 --- a/test/dm/k210_pll.c +++ b/test/dm/k210_pll.c @@ -33,7 +33,7 @@ static int dm_test_k210_pll_calc_config(u32 rate, u32 rate_in, error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio, r * od); /* The lower 16 bits are spurious */
error = abs((error - BIT(32))) >> 16;
error = abs((error >> 16) - BIT(32 - 16)); if (error < best_error) { best->r = r; best->f = f;-- 2.37.3
On 10/16/22 09:51, Michal Suchánek wrote:
On Thu, Oct 13, 2022 at 10:34:29PM +0200, Michal Suchanek wrote:
k210 is 64bit but the driver and tests are also built in sandbox, and that can be built 32bit.
BIT(32) does not work on 32bit, shift before subtraction to fit into 32bit integer with BIT values.
Also see https://patchwork.ozlabs.org/project/uboot/patch/20221016071035.461454-1-hei...
Signed-off-by: Michal Suchanek msuchanek@suse.de
drivers/clk/clk_k210.c | 2 +- test/dm/k210_pll.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/clk_k210.c b/drivers/clk/clk_k210.c index 1961efaa5e..e85f8ae14a 100644 --- a/drivers/clk/clk_k210.c +++ b/drivers/clk/clk_k210.c @@ -846,7 +846,7 @@ again:
error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio, r * od); /* The lower 16 bits are spurious */
error = abs((error - BIT(32))) >> 16;
error = abs((error >> 16) - BIT(32 - 16));
Your patch changes the results. Replacing BIT() by BIT_ULL() does not change the result:
error = -1 = 0xffffffffffffffff before error - BIT(32) = -4294967297 = 0xfffffffeffffffff abs(error - BIT(32)) = 4294967297 = 0x100000001 abs(error - BIT(32)) >> 16 = 65536 = 0x10000 after error >> 16 = -1 = 0xffffffffffffffff (error >> 16) - BIT(32 - 16) = -65537 = 0xfffffffffffeffff abs((error >> 16) - BIT(32 - 16)) = 65537 = 0x10001 using BIT_ULL abs(error - BIT_ULL(32)) >> 16 = 65536 = 0x10000
error = 70000 = 0x11170 before error - BIT(32) = -4294897296 = 0xffffffff00011170 abs(error - BIT(32)) = 4294897296 = 0xfffeee90 abs(error - BIT(32)) >> 16 = 65534 = 0xfffe after error >> 16 = 1 = 0x1 (error >> 16) - BIT(32 - 16) = -65535 = 0xffffffffffff0001 abs((error >> 16) - BIT(32 - 16)) = 65535 = 0xffff using BIT_ULL abs(error - BIT_ULL(32)) >> 16 = 65534 = 0xfffe
I assume this change of results is unintended.
We also replace abs() by abs64() to get correct results on a 32bit system:
error = -1 = 0xffffffffffffffff abs(error - BIT_ULL(32)) >> 16 = 0 = 0x0 abs64(error - BIT_ULL(32)) >> 16 = 65536 = 0x10000 error = 70000 = 0x11170 abs(error - BIT_ULL(32)) >> 16 = 1 = 0x1 abs64(error - BIT_ULL(32)) >> 16 = 65534 = 0xfffe
Best regards
Heinrich
if (error < best_error) { best->r = r;diff --git a/test/dm/k210_pll.c b/test/dm/k210_pll.c index a0cc84c396..622b1c9bef 100644 --- a/test/dm/k210_pll.c +++ b/test/dm/k210_pll.c @@ -33,7 +33,7 @@ static int dm_test_k210_pll_calc_config(u32 rate, u32 rate_in, error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio, r * od); /* The lower 16 bits are spurious */
error = abs((error - BIT(32))) >> 16;
error = abs((error >> 16) - BIT(32 - 16)); if (error < best_error) { best->r = r; best->f = f;-- 2.37.3
On 10/16/22 07:46, Heinrich Schuchardt wrote:
On 10/16/22 09:51, Michal Suchánek wrote:
On Thu, Oct 13, 2022 at 10:34:29PM +0200, Michal Suchanek wrote:
k210 is 64bit but the driver and tests are also built in sandbox, and that can be built 32bit.
BIT(32) does not work on 32bit, shift before subtraction to fit into 32bit integer with BIT values.
Also see https://patchwork.ozlabs.org/project/uboot/patch/20221016071035.461454-1-hei...
Signed-off-by: Michal Suchanek msuchanek@suse.de
drivers/clk/clk_k210.c | 2 +- test/dm/k210_pll.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/clk_k210.c b/drivers/clk/clk_k210.c index 1961efaa5e..e85f8ae14a 100644 --- a/drivers/clk/clk_k210.c +++ b/drivers/clk/clk_k210.c @@ -846,7 +846,7 @@ again: error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio, r * od); /* The lower 16 bits are spurious */ - error = abs((error - BIT(32))) >> 16; + error = abs((error >> 16) - BIT(32 - 16));
Your patch changes the results. Replacing BIT() by BIT_ULL() does not change the result:
error = -1 = 0xffffffffffffffff before error - BIT(32) = -4294967297 = 0xfffffffeffffffff abs(error - BIT(32)) = 4294967297 = 0x100000001 abs(error - BIT(32)) >> 16 = 65536 = 0x10000 after error >> 16 = -1 = 0xffffffffffffffff (error >> 16) - BIT(32 - 16) = -65537 = 0xfffffffffffeffff abs((error >> 16) - BIT(32 - 16)) = 65537 = 0x10001 using BIT_ULL abs(error - BIT_ULL(32)) >> 16 = 65536 = 0x10000
error = 70000 = 0x11170 before error - BIT(32) = -4294897296 = 0xffffffff00011170 abs(error - BIT(32)) = 4294897296 = 0xfffeee90 abs(error - BIT(32)) >> 16 = 65534 = 0xfffe after error >> 16 = 1 = 0x1 (error >> 16) - BIT(32 - 16) = -65535 = 0xffffffffffff0001 abs((error >> 16) - BIT(32 - 16)) = 65535 = 0xffff using BIT_ULL abs(error - BIT_ULL(32)) >> 16 = 65534 = 0xfffe
I assume this change of results is unintended.
We also replace abs() by abs64() to get correct results on a 32bit system:
error = -1 = 0xffffffffffffffff abs(error - BIT_ULL(32)) >> 16 = 0 = 0x0 abs64(error - BIT_ULL(32)) >> 16 = 65536 = 0x10000 error = 70000 = 0x11170 abs(error - BIT_ULL(32)) >> 16 = 1 = 0x1 abs64(error - BIT_ULL(32)) >> 16 = 65534 = 0xfffe
Best regards
Heinrich
if (error < best_error) { best->r = r; diff --git a/test/dm/k210_pll.c b/test/dm/k210_pll.c index a0cc84c396..622b1c9bef 100644 --- a/test/dm/k210_pll.c +++ b/test/dm/k210_pll.c @@ -33,7 +33,7 @@ static int dm_test_k210_pll_calc_config(u32 rate, u32 rate_in, error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio, r * od); /* The lower 16 bits are spurious */ - error = abs((error - BIT(32))) >> 16; + error = abs((error >> 16) - BIT(32 - 16)); if (error < best_error) { best->r = r; best->f = f; -- 2.37.3
IMO the driver should just be changed to depend on 64-bit. The k210 is 64-bit, and I didn't write anything with 32-bit in mind.
--Sean
On 10/16/22 16:19, Sean Anderson wrote:
On 10/16/22 07:46, Heinrich Schuchardt wrote:
On 10/16/22 09:51, Michal Suchánek wrote:
On Thu, Oct 13, 2022 at 10:34:29PM +0200, Michal Suchanek wrote:
k210 is 64bit but the driver and tests are also built in sandbox, and that can be built 32bit.
BIT(32) does not work on 32bit, shift before subtraction to fit into 32bit integer with BIT values.
Also see https://patchwork.ozlabs.org/project/uboot/patch/20221016071035.461454-1-hei...
Signed-off-by: Michal Suchanek msuchanek@suse.de
drivers/clk/clk_k210.c | 2 +- test/dm/k210_pll.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/clk_k210.c b/drivers/clk/clk_k210.c index 1961efaa5e..e85f8ae14a 100644 --- a/drivers/clk/clk_k210.c +++ b/drivers/clk/clk_k210.c @@ -846,7 +846,7 @@ again: error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio, r * od); /* The lower 16 bits are spurious */ - error = abs((error - BIT(32))) >> 16; + error = abs((error >> 16) - BIT(32 - 16));
Your patch changes the results. Replacing BIT() by BIT_ULL() does not change the result:
error = -1 = 0xffffffffffffffff before error - BIT(32) = -4294967297 = 0xfffffffeffffffff abs(error - BIT(32)) = 4294967297 = 0x100000001 abs(error - BIT(32)) >> 16 = 65536 = 0x10000 after error >> 16 = -1 = 0xffffffffffffffff (error >> 16) - BIT(32 - 16) = -65537 = 0xfffffffffffeffff abs((error >> 16) - BIT(32 - 16)) = 65537 = 0x10001 using BIT_ULL abs(error - BIT_ULL(32)) >> 16 = 65536 = 0x10000
error = 70000 = 0x11170 before error - BIT(32) = -4294897296 = 0xffffffff00011170 abs(error - BIT(32)) = 4294897296 = 0xfffeee90 abs(error - BIT(32)) >> 16 = 65534 = 0xfffe after error >> 16 = 1 = 0x1 (error >> 16) - BIT(32 - 16) = -65535 = 0xffffffffffff0001 abs((error >> 16) - BIT(32 - 16)) = 65535 = 0xffff using BIT_ULL abs(error - BIT_ULL(32)) >> 16 = 65534 = 0xfffe
I assume this change of results is unintended.
We also replace abs() by abs64() to get correct results on a 32bit system:
error = -1 = 0xffffffffffffffff abs(error - BIT_ULL(32)) >> 16 = 0 = 0x0 abs64(error - BIT_ULL(32)) >> 16 = 65536 = 0x10000 error = 70000 = 0x11170 abs(error - BIT_ULL(32)) >> 16 = 1 = 0x1 abs64(error - BIT_ULL(32)) >> 16 = 65534 = 0xfffe
Best regards
Heinrich
if (error < best_error) { best->r = r; diff --git a/test/dm/k210_pll.c b/test/dm/k210_pll.c index a0cc84c396..622b1c9bef 100644 --- a/test/dm/k210_pll.c +++ b/test/dm/k210_pll.c @@ -33,7 +33,7 @@ static int dm_test_k210_pll_calc_config(u32 rate, u32 rate_in, error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio, r * od); /* The lower 16 bits are spurious */ - error = abs((error - BIT(32))) >> 16; + error = abs((error >> 16) - BIT(32 - 16)); if (error < best_error) { best->r = r; best->f = f; -- 2.37.3
IMO the driver should just be changed to depend on 64-bit. The k210 is 64-bit, and I didn't write anything with 32-bit in mind.
Michal, Simon, and I are striving to get the sandbox working on ilp32 systems.
Do you suggest to remove the driver from sandbox_defconfig?
This would imply that the unit test is not executed on Gitlab CI. You will still be able to execute it on the actual hardware.
Best regards
Heinrich
On 10/16/22 10:40, Heinrich Schuchardt wrote:
On 10/16/22 16:19, Sean Anderson wrote:
On 10/16/22 07:46, Heinrich Schuchardt wrote:
On 10/16/22 09:51, Michal Suchánek wrote:
On Thu, Oct 13, 2022 at 10:34:29PM +0200, Michal Suchanek wrote:
k210 is 64bit but the driver and tests are also built in sandbox, and that can be built 32bit.
BIT(32) does not work on 32bit, shift before subtraction to fit into 32bit integer with BIT values.
Also see https://patchwork.ozlabs.org/project/uboot/patch/20221016071035.461454-1-hei...
Signed-off-by: Michal Suchanek msuchanek@suse.de
drivers/clk/clk_k210.c | 2 +- test/dm/k210_pll.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/clk_k210.c b/drivers/clk/clk_k210.c index 1961efaa5e..e85f8ae14a 100644 --- a/drivers/clk/clk_k210.c +++ b/drivers/clk/clk_k210.c @@ -846,7 +846,7 @@ again: error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio, r * od); /* The lower 16 bits are spurious */ - error = abs((error - BIT(32))) >> 16; + error = abs((error >> 16) - BIT(32 - 16));
Your patch changes the results. Replacing BIT() by BIT_ULL() does not change the result:
error = -1 = 0xffffffffffffffff before error - BIT(32) = -4294967297 = 0xfffffffeffffffff abs(error - BIT(32)) = 4294967297 = 0x100000001 abs(error - BIT(32)) >> 16 = 65536 = 0x10000 after error >> 16 = -1 = 0xffffffffffffffff (error >> 16) - BIT(32 - 16) = -65537 = 0xfffffffffffeffff abs((error >> 16) - BIT(32 - 16)) = 65537 = 0x10001 using BIT_ULL abs(error - BIT_ULL(32)) >> 16 = 65536 = 0x10000
error = 70000 = 0x11170 before error - BIT(32) = -4294897296 = 0xffffffff00011170 abs(error - BIT(32)) = 4294897296 = 0xfffeee90 abs(error - BIT(32)) >> 16 = 65534 = 0xfffe after error >> 16 = 1 = 0x1 (error >> 16) - BIT(32 - 16) = -65535 = 0xffffffffffff0001 abs((error >> 16) - BIT(32 - 16)) = 65535 = 0xffff using BIT_ULL abs(error - BIT_ULL(32)) >> 16 = 65534 = 0xfffe
I assume this change of results is unintended.
We also replace abs() by abs64() to get correct results on a 32bit system:
error = -1 = 0xffffffffffffffff abs(error - BIT_ULL(32)) >> 16 = 0 = 0x0 abs64(error - BIT_ULL(32)) >> 16 = 65536 = 0x10000 error = 70000 = 0x11170 abs(error - BIT_ULL(32)) >> 16 = 1 = 0x1 abs64(error - BIT_ULL(32)) >> 16 = 65534 = 0xfffe
Best regards
Heinrich
if (error < best_error) { best->r = r; diff --git a/test/dm/k210_pll.c b/test/dm/k210_pll.c index a0cc84c396..622b1c9bef 100644 --- a/test/dm/k210_pll.c +++ b/test/dm/k210_pll.c @@ -33,7 +33,7 @@ static int dm_test_k210_pll_calc_config(u32 rate, u32 rate_in, error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio, r * od); /* The lower 16 bits are spurious */ - error = abs((error - BIT(32))) >> 16; + error = abs((error >> 16) - BIT(32 - 16)); if (error < best_error) { best->r = r; best->f = f; -- 2.37.3
IMO the driver should just be changed to depend on 64-bit. The k210 is 64-bit, and I didn't write anything with 32-bit in mind.
Michal, Simon, and I are striving to get the sandbox working on ilp32 systems.
Do you suggest to remove the driver from sandbox_defconfig?
This would imply that the unit test is not executed on Gitlab CI. You will still be able to execute it on the actual hardware.
It's still enabled for sandbox64, so it should still be executed there.
--Sean
On 10/16/22 16:48, Sean Anderson wrote:
On 10/16/22 10:40, Heinrich Schuchardt wrote:
On 10/16/22 16:19, Sean Anderson wrote:
On 10/16/22 07:46, Heinrich Schuchardt wrote:
On 10/16/22 09:51, Michal Suchánek wrote:
On Thu, Oct 13, 2022 at 10:34:29PM +0200, Michal Suchanek wrote:
k210 is 64bit but the driver and tests are also built in sandbox, and that can be built 32bit.
BIT(32) does not work on 32bit, shift before subtraction to fit into 32bit integer with BIT values.
Also see https://patchwork.ozlabs.org/project/uboot/patch/20221016071035.461454-1-hei...
Signed-off-by: Michal Suchanek msuchanek@suse.de
drivers/clk/clk_k210.c | 2 +- test/dm/k210_pll.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/clk_k210.c b/drivers/clk/clk_k210.c index 1961efaa5e..e85f8ae14a 100644 --- a/drivers/clk/clk_k210.c +++ b/drivers/clk/clk_k210.c @@ -846,7 +846,7 @@ again: error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio, r * od); /* The lower 16 bits are spurious */ - error = abs((error - BIT(32))) >> 16; + error = abs((error >> 16) - BIT(32 - 16));
Your patch changes the results. Replacing BIT() by BIT_ULL() does not change the result:
error = -1 = 0xffffffffffffffff before error - BIT(32) = -4294967297 = 0xfffffffeffffffff abs(error - BIT(32)) = 4294967297 = 0x100000001 abs(error - BIT(32)) >> 16 = 65536 = 0x10000 after error >> 16 = -1 = 0xffffffffffffffff (error >> 16) - BIT(32 - 16) = -65537 = 0xfffffffffffeffff abs((error >> 16) - BIT(32 - 16)) = 65537 = 0x10001 using BIT_ULL abs(error - BIT_ULL(32)) >> 16 = 65536 = 0x10000
error = 70000 = 0x11170 before error - BIT(32) = -4294897296 = 0xffffffff00011170 abs(error - BIT(32)) = 4294897296 = 0xfffeee90 abs(error - BIT(32)) >> 16 = 65534 = 0xfffe after error >> 16 = 1 = 0x1 (error >> 16) - BIT(32 - 16) = -65535 = 0xffffffffffff0001 abs((error >> 16) - BIT(32 - 16)) = 65535 = 0xffff using BIT_ULL abs(error - BIT_ULL(32)) >> 16 = 65534 = 0xfffe
I assume this change of results is unintended.
We also replace abs() by abs64() to get correct results on a 32bit system:
error = -1 = 0xffffffffffffffff abs(error - BIT_ULL(32)) >> 16 = 0 = 0x0 abs64(error - BIT_ULL(32)) >> 16 = 65536 = 0x10000 error = 70000 = 0x11170 abs(error - BIT_ULL(32)) >> 16 = 1 = 0x1 abs64(error - BIT_ULL(32)) >> 16 = 65534 = 0xfffe
Best regards
Heinrich
if (error < best_error) { best->r = r; diff --git a/test/dm/k210_pll.c b/test/dm/k210_pll.c index a0cc84c396..622b1c9bef 100644 --- a/test/dm/k210_pll.c +++ b/test/dm/k210_pll.c @@ -33,7 +33,7 @@ static int dm_test_k210_pll_calc_config(u32 rate, u32 rate_in, error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio, r * od); /* The lower 16 bits are spurious */ - error = abs((error - BIT(32))) >> 16; + error = abs((error >> 16) - BIT(32 - 16)); if (error < best_error) { best->r = r; best->f = f; -- 2.37.3
IMO the driver should just be changed to depend on 64-bit. The k210 is 64-bit, and I didn't write anything with 32-bit in mind.
Michal, Simon, and I are striving to get the sandbox working on ilp32 systems.
Do you suggest to remove the driver from sandbox_defconfig?
This would imply that the unit test is not executed on Gitlab CI. You will still be able to execute it on the actual hardware.
It's still enabled for sandbox64, so it should still be executed there.
No, the sandbox64 is also to be compiled on ilp32. It models physical address extension (PAE).
Best regards
Heinrich
On 10/16/22 10:50, Heinrich Schuchardt wrote:
On 10/16/22 16:48, Sean Anderson wrote:
On 10/16/22 10:40, Heinrich Schuchardt wrote:
On 10/16/22 16:19, Sean Anderson wrote:
On 10/16/22 07:46, Heinrich Schuchardt wrote:
On 10/16/22 09:51, Michal Suchánek wrote:
On Thu, Oct 13, 2022 at 10:34:29PM +0200, Michal Suchanek wrote: > k210 is 64bit but the driver and tests are also built in sandbox, and > that can be built 32bit. > > BIT(32) does not work on 32bit, shift before subtraction to fit into > 32bit integer with BIT values.
Also see https://patchwork.ozlabs.org/project/uboot/patch/20221016071035.461454-1-hei... > > Signed-off-by: Michal Suchanek msuchanek@suse.de > --- > > drivers/clk/clk_k210.c | 2 +- > test/dm/k210_pll.c | 2 +- > 2 files changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/clk/clk_k210.c b/drivers/clk/clk_k210.c > index 1961efaa5e..e85f8ae14a 100644 > --- a/drivers/clk/clk_k210.c > +++ b/drivers/clk/clk_k210.c > @@ -846,7 +846,7 @@ again: > error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio, r * od); > /* The lower 16 bits are spurious */ > - error = abs((error - BIT(32))) >> 16; > + error = abs((error >> 16) - BIT(32 - 16));
Your patch changes the results. Replacing BIT() by BIT_ULL() does not change the result:
error = -1 = 0xffffffffffffffff before error - BIT(32) = -4294967297 = 0xfffffffeffffffff abs(error - BIT(32)) = 4294967297 = 0x100000001 abs(error - BIT(32)) >> 16 = 65536 = 0x10000 after error >> 16 = -1 = 0xffffffffffffffff (error >> 16) - BIT(32 - 16) = -65537 = 0xfffffffffffeffff abs((error >> 16) - BIT(32 - 16)) = 65537 = 0x10001 using BIT_ULL abs(error - BIT_ULL(32)) >> 16 = 65536 = 0x10000
error = 70000 = 0x11170 before error - BIT(32) = -4294897296 = 0xffffffff00011170 abs(error - BIT(32)) = 4294897296 = 0xfffeee90 abs(error - BIT(32)) >> 16 = 65534 = 0xfffe after error >> 16 = 1 = 0x1 (error >> 16) - BIT(32 - 16) = -65535 = 0xffffffffffff0001 abs((error >> 16) - BIT(32 - 16)) = 65535 = 0xffff using BIT_ULL abs(error - BIT_ULL(32)) >> 16 = 65534 = 0xfffe
I assume this change of results is unintended.
We also replace abs() by abs64() to get correct results on a 32bit system:
error = -1 = 0xffffffffffffffff abs(error - BIT_ULL(32)) >> 16 = 0 = 0x0 abs64(error - BIT_ULL(32)) >> 16 = 65536 = 0x10000 error = 70000 = 0x11170 abs(error - BIT_ULL(32)) >> 16 = 1 = 0x1 abs64(error - BIT_ULL(32)) >> 16 = 65534 = 0xfffe
Best regards
Heinrich
> if (error < best_error) { > best->r = r; > diff --git a/test/dm/k210_pll.c b/test/dm/k210_pll.c > index a0cc84c396..622b1c9bef 100644 > --- a/test/dm/k210_pll.c > +++ b/test/dm/k210_pll.c > @@ -33,7 +33,7 @@ static int dm_test_k210_pll_calc_config(u32 rate, u32 rate_in, > error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio, > r * od); > /* The lower 16 bits are spurious */ > - error = abs((error - BIT(32))) >> 16; > + error = abs((error >> 16) - BIT(32 - 16)); > if (error < best_error) { > best->r = r; > best->f = f; > -- > 2.37.3 >
IMO the driver should just be changed to depend on 64-bit. The k210 is 64-bit, and I didn't write anything with 32-bit in mind.
Michal, Simon, and I are striving to get the sandbox working on ilp32 systems.
Do you suggest to remove the driver from sandbox_defconfig?
This would imply that the unit test is not executed on Gitlab CI. You will still be able to execute it on the actual hardware.
It's still enabled for sandbox64, so it should still be executed there.
No, the sandbox64 is also to be compiled on ilp32. It models physical address extension (PAE).
Do we have a config for word size? PHYS_64BIT seems to be for the address size.
--Sean
On 10/16/22 16:57, Sean Anderson wrote:
On 10/16/22 10:50, Heinrich Schuchardt wrote:
On 10/16/22 16:48, Sean Anderson wrote:
On 10/16/22 10:40, Heinrich Schuchardt wrote:
On 10/16/22 16:19, Sean Anderson wrote:
On 10/16/22 07:46, Heinrich Schuchardt wrote:
On 10/16/22 09:51, Michal Suchánek wrote: > On Thu, Oct 13, 2022 at 10:34:29PM +0200, Michal Suchanek wrote: >> k210 is 64bit but the driver and tests are also built in >> sandbox, and >> that can be built 32bit. >> >> BIT(32) does not work on 32bit, shift before subtraction to fit >> into >> 32bit integer with BIT values. > > > Also see > https://patchwork.ozlabs.org/project/uboot/patch/20221016071035.461454-1-hei... >> >> Signed-off-by: Michal Suchanek msuchanek@suse.de >> --- >> >> drivers/clk/clk_k210.c | 2 +- >> test/dm/k210_pll.c | 2 +- >> 2 files changed, 2 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/clk/clk_k210.c b/drivers/clk/clk_k210.c >> index 1961efaa5e..e85f8ae14a 100644 >> --- a/drivers/clk/clk_k210.c >> +++ b/drivers/clk/clk_k210.c >> @@ -846,7 +846,7 @@ again: >> error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio, r * od); >> /* The lower 16 bits are spurious */ >> - error = abs((error - BIT(32))) >> 16; >> + error = abs((error >> 16) - BIT(32 - 16));
Your patch changes the results. Replacing BIT() by BIT_ULL() does not change the result:
error = -1 = 0xffffffffffffffff before error - BIT(32) = -4294967297 = 0xfffffffeffffffff abs(error - BIT(32)) = 4294967297 = 0x100000001 abs(error - BIT(32)) >> 16 = 65536 = 0x10000 after error >> 16 = -1 = 0xffffffffffffffff (error >> 16) - BIT(32 - 16) = -65537 = 0xfffffffffffeffff abs((error >> 16) - BIT(32 - 16)) = 65537 = 0x10001 using BIT_ULL abs(error - BIT_ULL(32)) >> 16 = 65536 = 0x10000
error = 70000 = 0x11170 before error - BIT(32) = -4294897296 = 0xffffffff00011170 abs(error - BIT(32)) = 4294897296 = 0xfffeee90 abs(error - BIT(32)) >> 16 = 65534 = 0xfffe after error >> 16 = 1 = 0x1 (error >> 16) - BIT(32 - 16) = -65535 = 0xffffffffffff0001 abs((error >> 16) - BIT(32 - 16)) = 65535 = 0xffff using BIT_ULL abs(error - BIT_ULL(32)) >> 16 = 65534 = 0xfffe
I assume this change of results is unintended.
We also replace abs() by abs64() to get correct results on a 32bit system:
error = -1 = 0xffffffffffffffff abs(error - BIT_ULL(32)) >> 16 = 0 = 0x0 abs64(error - BIT_ULL(32)) >> 16 = 65536 = 0x10000 error = 70000 = 0x11170 abs(error - BIT_ULL(32)) >> 16 = 1 = 0x1 abs64(error - BIT_ULL(32)) >> 16 = 65534 = 0xfffe
Best regards
Heinrich
>> if (error < best_error) { >> best->r = r; >> diff --git a/test/dm/k210_pll.c b/test/dm/k210_pll.c >> index a0cc84c396..622b1c9bef 100644 >> --- a/test/dm/k210_pll.c >> +++ b/test/dm/k210_pll.c >> @@ -33,7 +33,7 @@ static int dm_test_k210_pll_calc_config(u32 >> rate, u32 rate_in, >> error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio, >> r * od); >> /* The lower 16 bits are spurious */ >> - error = abs((error - BIT(32))) >> 16; >> + error = abs((error >> 16) - BIT(32 - 16)); >> if (error < best_error) { >> best->r = r; >> best->f = f; >> -- >> 2.37.3 >>
IMO the driver should just be changed to depend on 64-bit. The k210 is 64-bit, and I didn't write anything with 32-bit in mind.
Michal, Simon, and I are striving to get the sandbox working on ilp32 systems.
Do you suggest to remove the driver from sandbox_defconfig?
This would imply that the unit test is not executed on Gitlab CI. You will still be able to execute it on the actual hardware.
It's still enabled for sandbox64, so it should still be executed there.
No, the sandbox64 is also to be compiled on ilp32. It models physical address extension (PAE).
Do we have a config for word size? PHYS_64BIT seems to be for the address size.
phys_addr_t is what is used to address physical memory which may be 64bit on a 32bit PAE system (CONFIG_PHYS_64BIT=y).
Compiling on armv7 yields 32bit pointers.
There are two alternative patches in review removing HOST_32BIT and HOST_64BIT:
https://patchwork.ozlabs.org/project/uboot/patch/20221014064052.5592-1-heinr...
https://patchwork.ozlabs.org/project/uboot/patch/20221013203429.15200-1-msuc...
Best regards
Heinrich
Hello,
On Sun, Oct 16, 2022 at 05:02:38PM +0200, Heinrich Schuchardt wrote:
On 10/16/22 16:57, Sean Anderson wrote:
On 10/16/22 10:50, Heinrich Schuchardt wrote:
On 10/16/22 16:48, Sean Anderson wrote:
On 10/16/22 10:40, Heinrich Schuchardt wrote:
On 10/16/22 16:19, Sean Anderson wrote:
On 10/16/22 07:46, Heinrich Schuchardt wrote: > > > On 10/16/22 09:51, Michal Suchánek wrote: > > On Thu, Oct 13, 2022 at 10:34:29PM +0200, Michal Suchanek wrote: > > > k210 is 64bit but the driver and tests are > > > also built in sandbox, and > > > that can be built 32bit. > > > > > > BIT(32) does not work on 32bit, shift before > > > subtraction to fit into > > > 32bit integer with BIT values.
IMO the driver should just be changed to depend on 64-bit. The k210 is 64-bit, and I didn't write anything with 32-bit in mind.
Michal, Simon, and I are striving to get the sandbox working on ilp32 systems.
Do you suggest to remove the driver from sandbox_defconfig?
This would imply that the unit test is not executed on Gitlab CI. You will still be able to execute it on the actual hardware.
It's still enabled for sandbox64, so it should still be executed there.
No, the sandbox64 is also to be compiled on ilp32. It models physical address extension (PAE).
Do we have a config for word size? PHYS_64BIT seems to be for the address size.
phys_addr_t is what is used to address physical memory which may be 64bit on a 32bit PAE system (CONFIG_PHYS_64BIT=y).
Compiling on armv7 yields 32bit pointers.
There are two alternative patches in review removing HOST_32BIT and HOST_64BIT:
https://patchwork.ozlabs.org/project/uboot/patch/20221014064052.5592-1-heinr...
https://patchwork.ozlabs.org/project/uboot/patch/20221013203429.15200-1-msuc...
I don't think that we have a config option that can be used to detect that the build is 64bit. Such option may exit per platform but drivers that can be built for multiple platforms will have hard time detecting it.
I think that Heinrich's suggestion to use BIT_ULL instead of BIT and abs64 instead of abs is non-controversial. It's technically more correct way to write the expression although relevant only for 32bit.
Thanks
Michal
participants (4)
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Heinrich Schuchardt -
Michal Suchanek -
Michal Suchánek
-
Sean Anderson